


Apple Macintosh XL Serial B
25 PIN D-SUB CONNECTOR
  
    | Pin | Name | Description | 
  
    | 1 | GND | Ground | 
  
    | 2 | TxD- | Transmit Data line | 
  
    | 3 | RxD- | Receive Data line | 
  
    | 4 | n/c | Not connected | 
  
    | 5 | n/c | Not connected | 
  
    | 6 | HSK/DSR | TRxCB or CTSB | 
  
    | 7 | GND | Ground | 
  
    | 8 | n/c | Not connected | 
  
    | 9 | n/c | Not connected | 
  
    | 10 | n/c | Not connected | 
  
    | 11 | n/c | Not connected | 
  
    | 12 | n/c | Not connected | 
  
    | 13 | n/c | Not connected | 
  
    | 14 | n/c | Not connected | 
  
    | 15 | n/c | Not connected | 
  
    | 16 | n/c | Not connected | 
  
    | 17 | n/c | Not connected | 
  
    | 18 | n/c | Not connected | 
  
    | 19 | RxD+ | Receive Data line | 
  
    | 20 | TxD+/DTR | Connected to DTRB | 
  
    | 21 | n/c | Not connected | 
  
    | 22 | n/c | Not connected | 
  
    | 23 | n/c | Not connected | 
  
    | 24 | n/c | Not connected | 
  
    | 25 | n/c | Not connected | 
  Copyright © The Hardware Book Team 1996-2004.
  May be copied and redistributed, partially or in whole, as appropriate.
  Document last modified: 2002-01-10